YOFC's stock plummeted 5.09% intraday, marking a significant pullback after recent gains.

The decline appears to be driven by profit-taking following an extended rally that was fueled by NVIDIA's announcement of a strategic partnership with Corning, which committed up to USD 3.2 billion to build three new optical fiber factories. This partnership had catalyzed a sector-wide surge, with YOFC having risen over 370% year-to-date as markets repriced the stock from a traditional telecom infrastructure supplier to a core AI computing infrastructure provider.

With the stock trading at a high valuation with a P/E ratio of approximately 173x, the intraday decline is consistent with near-term profit-taking activity after the powerful multi-day rally.